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Other assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Other Assets [Abstract]    
Inventory $ 30,971 $ 38,972
Debt issuance costs 36,814 43,241
Lease incentives 251,961 213,684
Other receivables 220,289 351,925
Investments (Note 10) 132,113 122,946
Notes receivables 58,994 22,497
Derivative assets 69,105 48,896
Other tangible fixed assets 29,151 31,114
Straight-line rents, prepaid expenses and other 79,792 106,655
Other assets $ 909,190 $ 979,930